title: Construction of planar and bulk integrated heterojunction polymer solar cells using cross-linkable D-A copolymer.
abstract: An integrated device architecture was constructed via vertical combination of planar and bulk heterojunctions by solution processing, where a cross-linked D-A copolymer (PBDTTT-Br25) was inserted between a PEDOT:PSS layer and the blended photoactive layer. PBDTTT-Br25 can readily undergo photo crosslinking to form an insoluble robust film via ultraviolet irradiation after solution-deposition, which enables the subsequent solution processing of a photoactive layer on the robust surface. The insertion of a pure PBDTTT-Br25 layer to build an integrated heterojunction could provide an additional donor/acceptor interface, which enables hole transport to the anode without interruption, thereby reducing the charge carrier recombination probability. The power conversion efficiency (PCE) of the polymer solar cell (PSC) with the integrated architecture reaches 5.24% under an AM1.5G illumination of 100 mW/cm(2), which is increased by 65%, in comparison with that of the reference single heterojunction device (3.17%), under the same experimental conditions.
authors.affiliation: State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, the New and Renewable Energy of Beijing Key Laboratory, North China Electric Power University, Beijing 102206, People's Republic of China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Xu
authors.forename: Fuzhi
authors.initials: F
authors.lastname: Wang
authors.forename: Deping
authors.initials: D
authors.lastname: Qian
authors.forename: Zhan'ao
authors.initials: Z
authors.lastname: Tan
authors.forename: Liangjie
authors.initials: L
authors.lastname: Li
authors.forename: Shusheng
authors.initials: S
authors.lastname: Li
authors.forename: Xiaohe
authors.initials: X
authors.lastname: Tu
authors.forename: Gang
authors.initials: G
authors.lastname: Sun
authors.forename: Xuliang
authors.initials: X
authors.lastname: Hou
authors.forename: Jianhui
authors.initials: J
authors.lastname: Hou
authors.forename: Yongfang
authors.initials: Y
authors.lastname: Li